Staging: comedi: Add include of <linux/sched.h> to fix build

[Roland Dreier]

Commit a99bbaf5 ("headers: remove sched.h from poll.h") removed the
implicit include of <linux/sched.h> via <linux/poll.h>, and broke the
comedi build with errors like:

    drivers/staging/comedi/drivers/serial2002.c:201: error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)

Explicitly include <linux/sched.h> to fix this.

Signed-off-by: Roland Dreier <rolandd@xxxxxxxxx>
---
 drivers/staging/comedi/drivers/serial2002.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/comedi/drivers/serial2002.c b/drivers/staging/comedi/drivers/serial2002.c
index a219679..3b706ca 100644
--- a/drivers/staging/comedi/drivers/serial2002.c
+++ b/drivers/staging/comedi/drivers/serial2002.c
@@ -40,6 +40,7 @@ Status: in development
 #include <asm/ioctls.h>
 #include <linux/serial.h>
 #include <linux/poll.h>
+#include <linux/sched.h>
 
 /*
  * Board descriptions for two imaginary boards.  Describing the
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